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256 lines
7 KiB
C
256 lines
7 KiB
C
/* GStreamer Mixer
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* Copyright (C) 2003 Ronald Bultje <rbultje@ronald.bitfreak.net>
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*
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* mixer.c: mixer design virtual class function wrappers
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "mixer.h"
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#include "mixer-marshal.h"
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enum
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{
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MUTE_TOGGLED,
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RECORD_TOGGLED,
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VOLUME_CHANGED,
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LAST_SIGNAL
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};
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static void gst_mixer_class_init (GstMixerClass * klass);
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static guint gst_mixer_signals[LAST_SIGNAL] = { 0 };
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GType
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gst_mixer_get_type (void)
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{
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static GType gst_mixer_type = 0;
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if (!gst_mixer_type) {
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static const GTypeInfo gst_mixer_info = {
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sizeof (GstMixerClass),
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(GBaseInitFunc) gst_mixer_class_init,
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NULL,
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NULL,
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NULL,
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NULL,
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0,
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0,
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NULL,
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};
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gst_mixer_type = g_type_register_static (G_TYPE_INTERFACE,
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"GstMixer", &gst_mixer_info, 0);
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g_type_interface_add_prerequisite (gst_mixer_type,
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GST_TYPE_IMPLEMENTS_INTERFACE);
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}
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return gst_mixer_type;
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}
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static void
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gst_mixer_class_init (GstMixerClass * klass)
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{
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static gboolean initialized = FALSE;
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if (!initialized) {
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gst_mixer_signals[RECORD_TOGGLED] =
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g_signal_new ("record-toggled",
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GST_TYPE_MIXER, G_SIGNAL_RUN_LAST,
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G_STRUCT_OFFSET (GstMixerClass, record_toggled),
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NULL, NULL,
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gst_mixer_marshal_VOID__OBJECT_BOOLEAN, G_TYPE_NONE, 2,
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GST_TYPE_MIXER_TRACK, G_TYPE_BOOLEAN);
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gst_mixer_signals[MUTE_TOGGLED] =
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g_signal_new ("mute-toggled",
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GST_TYPE_MIXER, G_SIGNAL_RUN_LAST,
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G_STRUCT_OFFSET (GstMixerClass, mute_toggled),
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NULL, NULL,
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gst_mixer_marshal_VOID__OBJECT_BOOLEAN, G_TYPE_NONE, 2,
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GST_TYPE_MIXER_TRACK, G_TYPE_BOOLEAN);
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gst_mixer_signals[VOLUME_CHANGED] =
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g_signal_new ("volume-changed",
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GST_TYPE_MIXER, G_SIGNAL_RUN_LAST,
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G_STRUCT_OFFSET (GstMixerClass, volume_changed),
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NULL, NULL,
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gst_mixer_marshal_VOID__OBJECT_POINTER, G_TYPE_NONE, 2,
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GST_TYPE_MIXER_TRACK, G_TYPE_POINTER);
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initialized = TRUE;
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}
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klass->mixer_type = GST_MIXER_SOFTWARE;
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/* default virtual functions */
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klass->list_tracks = NULL;
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klass->set_volume = NULL;
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klass->get_volume = NULL;
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klass->set_mute = NULL;
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klass->set_record = NULL;
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}
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/**
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*agst_mixer_list_tracks:
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* @mixer: the #GstMixer (a #GstElement) to get the tracks from.
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*
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* Returns a list of avialable tracks for this mixer/element. Note
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* that it is allowed for sink (output) elements to only provide
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* the output tracks in this list. Likewise, for sources (inputs),
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* it is allowed to only provide input elements in this list.
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*
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* Returns: A #GList consisting of zero or more #GstMixerTracks.
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*/
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const GList *
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gst_mixer_list_tracks (GstMixer * mixer)
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{
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GstMixerClass *klass = GST_MIXER_GET_CLASS (mixer);
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if (klass->list_tracks) {
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return klass->list_tracks (mixer);
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}
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return NULL;
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}
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/**
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* gst_mixer_set_volume:
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* @mixer: The #GstMixer (a #GstElement) that owns the track.
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* @track: The #GstMixerTrack to set the volume on.
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* @volumes: an array of integers (of size track->num_channels)
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* that gives the wanted volume for each channel in
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* this track.
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*
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* Sets the volume on each channel in a track. Short note about
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* naming: a track is defined as one separate stream owned by
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* the mixer/element, such as 'Line-in' or 'Microphone'. A
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* channel is said to be a mono-stream inside this track. A
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* stereo track thus contains two channels.
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*/
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void
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gst_mixer_set_volume (GstMixer * mixer, GstMixerTrack * track, gint * volumes)
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{
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GstMixerClass *klass = GST_MIXER_GET_CLASS (mixer);
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if (klass->set_volume) {
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klass->set_volume (mixer, track, volumes);
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}
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}
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/*
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* gst_mixer_get_volume:
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* @mixer: the #GstMixer (a #GstElement) that owns the track
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* @track: the GstMixerTrack to get the volume from.
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* @volumes: a pre-allocated array of integers (of size
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* track->num_channels) to store the current volume
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* of each channel in the given track in.
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*
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* Get the current volume(s) on the given track.
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*/
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void
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gst_mixer_get_volume (GstMixer * mixer, GstMixerTrack * track, gint * volumes)
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{
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GstMixerClass *klass = GST_MIXER_GET_CLASS (mixer);
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if (klass->get_volume) {
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klass->get_volume (mixer, track, volumes);
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} else {
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gint i;
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for (i = 0; i < track->num_channels; i++) {
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volumes[i] = 0;
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}
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}
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}
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/**
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* gst_mixer_set_mute:
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* @mixer: the #GstMixer (a #GstElement) that owns the track.
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* @track: the #GstMixerTrack to operate on.
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* @mute: a boolean value indicating whether to turn on or off
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* muting.
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*
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* Mutes or unmutes the given channel. To find out whether a
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* track is currently muted, use GST_MIXER_TRACK_HAS_FLAG ().
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*/
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void
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gst_mixer_set_mute (GstMixer * mixer, GstMixerTrack * track, gboolean mute)
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{
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GstMixerClass *klass = GST_MIXER_GET_CLASS (mixer);
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if (klass->set_mute) {
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klass->set_mute (mixer, track, mute);
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}
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}
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/**
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* gst_mixer_set_record:
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* @mixer: The #GstMixer (a #GstElement) that owns the track.
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* @track: the #GstMixerTrack to operate on.
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* @record: a boolean value that indicates whether to turn on
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* or off recording.
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*
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* Enables or disables recording on the given track. Note that
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* this is only possible on input tracks, not on output tracks
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* (see GST_MIXER_TRACK_HAS_FLAG () and the GST_MIXER_TRACK_INPUT
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* flag).
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*/
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void
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gst_mixer_set_record (GstMixer * mixer, GstMixerTrack * track, gboolean record)
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{
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GstMixerClass *klass = GST_MIXER_GET_CLASS (mixer);
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if (klass->set_record) {
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klass->set_record (mixer, track, record);
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}
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}
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void
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gst_mixer_mute_toggled (GstMixer * mixer, GstMixerTrack * track, gboolean mute)
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{
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g_signal_emit (G_OBJECT (mixer),
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gst_mixer_signals[MUTE_TOGGLED], 0, track, mute);
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g_signal_emit_by_name (G_OBJECT (track), "mute_toggled", mute);
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}
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void
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gst_mixer_record_toggled (GstMixer * mixer,
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GstMixerTrack * track, gboolean record)
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{
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g_signal_emit (G_OBJECT (mixer),
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gst_mixer_signals[RECORD_TOGGLED], 0, track, record);
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g_signal_emit_by_name (G_OBJECT (track), "record_toggled", record);
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}
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void
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gst_mixer_volume_changed (GstMixer * mixer,
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GstMixerTrack * track, gint * volumes)
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{
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g_signal_emit (G_OBJECT (mixer),
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gst_mixer_signals[VOLUME_CHANGED], 0, track, volumes);
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g_signal_emit_by_name (G_OBJECT (track), "volume_changed", volumes);
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}
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